The September 11, 2001, terrorist attacks

Terrorists struck the United States in a deadly series of attacks on Sept. 11, 2001. Here is a gallery of select photos from that day.

Associated Press

The twin towers of the World Trade Center burn behind the Empire State Building in New York, Sept. 11, 2001.

Associated Press

A jet airliner is lined up on one of the World Trade Center towers in New York on Tuesday, Sept. 11, 2001.

Associated Press

Smoke billows from one of the towers of the World Trade Center and flames and debris explode from the second tower, Tuesday, Sept. 11, 2001.

Associated Press

The south tower collapses as smoke billows from both towers of the World Trade Center in New York, Tuesday, Sept. 11, 2001.

Associated Press

People run from the collapse of one of the twin towers of New York's World Trade Center on Sept. 11, 2001.

Associated Press

Part of the Pentagon lies collapsed in Washington D.C. after a hijacked plane crashed into it Sept. 11, 2001.

Associated Press

Emergency workers look at the crater created when United Airlines Flight 93 crashed near Shanksville, Pa., on Sept. 11, 2001.

Associated Press

In this black-and-white photo, people make their way amid debris near the World Trade Center in New York on Sept. 11, 2001.

Associated Press

Firefighters make their way through the rubble after terrorists crashed two airliners into the World Trade Center in a deadly series of blows Sept. 11, 2001, that brought down the twin 110-story towers in New York.

Associated Press

President George W. Bush puts his arms around firefighter Bob Beckwith while standing in front of the World Trade Center in New York on Sept. 14, 2001.